On Tuesday, Sept. 26, The Regency Ballroom in San Francisco was filled with loud shrieks and cheers of enthusiastic radio contest winners. The cause for all of the excitement: An exclusive concert with burgeoning pop artist Shawn Mendes. Presented by XFINITY, WiLD 94.9’s One Night with Shawn Mendes was a special win-your-way-in event, and if the screams before the show were any indication, Mendes’s fans were ready for a night of live music.